CN110358982A - A kind of preparation method of screw vacuum pump rotor - Google Patents

A kind of preparation method of screw vacuum pump rotor Download PDF

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Publication number
CN110358982A
CN110358982A CN201910728865.2A CN201910728865A CN110358982A CN 110358982 A CN110358982 A CN 110358982A CN 201910728865 A CN201910728865 A CN 201910728865A CN 110358982 A CN110358982 A CN 110358982A
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CN
China
Prior art keywords
vacuum pump
screw vacuum
pump rotor
content
carried out
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201910728865.2A
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Chinese (zh)
Inventor
王来彬
陈家银
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Zibo Tongpu Vacuum Equipment Co Ltd
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Zibo Tongpu Vacuum Equipment Co Ltd
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Filing date
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Application filed by Zibo Tongpu Vacuum Equipment Co Ltd filed Critical Zibo Tongpu Vacuum Equipment Co Ltd
Priority to CN201910728865.2A priority Critical patent/CN110358982A/en
Publication of CN110358982A publication Critical patent/CN110358982A/en
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C18/082—Details specially related to intermeshing engagement type pumps
    • F04C18/084—Toothed wheels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C25/00—Adaptations of pumps for special use of pumps for elastic fluids
    • F04C25/02—Adaptations of pumps for special use of pumps for elastic fluids for producing high vacuum
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2230/00—Manufacture
    • F04C2230/20—Manufacture essentially without removing material
    • F04C2230/21—Manufacture essentially without removing material by casting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2230/00—Manufacture
    • F04C2230/40—Heat treatment
    • F04C2230/41—Hardening; Annealing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/20—Rotors

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)

Abstract

The invention discloses a kind of preparation methods of screw vacuum pump rotor, comprising the following steps: step 1: iron, carbon, silicon, sulphur, phosphorus, chromium, nickel, molybdenum, violent and other microelements being selected to prepare screw vacuum pump blank material requested；Step 2: material is quenched；Step 3: rough-cast is carried out by rotator model；Step 4: it tests to blank；Step 5: blank is heat-treated；Step 6: machine automatization roughing is carried out to screw vacuum pump rotor；Step 7: first time dynamic balancing inspection is carried out to screw vacuum pump rotor；Step 8: third time annealing is carried out to screw vacuum pump rotor；Step 9: screw vacuum pump rotor is carried out to carry out machine finishing processing；Step 10: last dynamic balancing inspection is carried out to screw vacuum pump rotor.The present invention has the advantages that the screw vacuum pump rotor strength and toughness of preparation are high, thermal expansion coefficient is small, Cutting free processing, good corrosion resistance, can adapt to complex environment.

Description

A kind of preparation method of screw vacuum pump rotor
Technical field
The present invention relates to screw vacuum pump rotor technology field, in particular to a kind of preparation sides of screw vacuum pump rotor Method.
Background technique
Screw vacuum pump configuration is simple, is widely used in the fields such as chemical industry, pharmacy, petrochemical industry, electronics, nuclear power.Vacuum pump turns Son is the core component of pump, and the reliability of rotor directly influences the service life of pump.The screw vacuum of present most domestic Pump rotor uses spheroidal graphite cast-iron rotor, and Ni-P coating, Hastelloy coating or PTFE coating are plated in surface.Abnormal nodularizing is spheroidal graphite Cast-iron rotor frequently problem, the graphite in casting are in lumps, shape of blooming, dendritic crystalline, vermiform, slab-like more, It is easy to cause insufficient rigidity in this way, to influence using safe and service life.Coating adhesion is not strong simultaneously, coating is easy to fall off To cause rotor fails and scrap.
Summary of the invention
The technical problem to be solved by the present invention is in view of the above problems, it is strong to provide a kind of screw vacuum pump rotor prepared Degree and toughness are high, thermal expansion coefficient is small, Cutting free processing, good corrosion resistance, can adapt to a kind of screw vacuum pump of complex environment The preparation method of rotor.
In order to solve the above technical problems, technical solution provided by the invention are as follows: a kind of preparation side of screw vacuum pump rotor Method, comprising the following steps:
Step 1: iron, carbon, silicon, sulphur, phosphorus, chromium, nickel, molybdenum, violent and other microelements are selected to prepare screw vacuum pump blank Material requested, wherein iron content 80.88~80.98%, carbon element content 0.03~0.04%, silicon content 0.35~ 0.45%, sulfur content 0.015~0.025%, phosphorus element content 0.01~0.02%, chromium content 13.0~ 13.5%, nickel element content 4.1~4.2%, molybdenum element content 0.4~0.5%, manganese element content 0.7~0.8%, other are micro- Secondary element 0.2~0.5%；
Step 2: the material that step 1 is prepared is quenched, 950~1050 degrees Celsius of hardening heat, air-cooled Heat preservation 30~60 minutes；
Step 3: rough-cast is carried out by rotator model；
Step 4: the blank completed to casting is tested, and inspection content includes dimension control, appearance test, physical and chemical inspection It tests and mechanical performance test,
Step 5: being heat-treated blank, and heat treatment is once annealed including normalizing and double annealing, an annealing temperature At 520~620 degrees Celsius, soaking time 90~150 minutes, double annealing temperature is at 540~640 degrees Celsius, soaking time 150 ~210 minutes；
Step 6: machine automatization roughing is carried out to the screw vacuum pump rotor for completing step 5；
Step 7: first time dynamic balancing inspection is carried out to the screw vacuum pump rotor for completing step 6；
Step 8: third time annealing is carried out to the screw vacuum pump rotor for completing step 7, annealing temperature exists three times 540~640 degrees Celsius, soaking time 150~210 minutes；
Step 9: the screw vacuum pump rotor for completing step 8 is carried out to carry out machine finishing processing；
Step 10: last dynamic balancing inspection is carried out to the screw vacuum pump rotor for completing step 9.
The advantages of the present invention over the prior art are that: the chromium in material makes rotor corrosion resistance with higher And fatigue resistance, nickel element increase back permeability, increase the reversed austenite in drawing process, molybdenum element increases temper resistance, Temper brittleness is reduced, and corrosion resistance can be improved, manganese element mainly plays deoxidation, the microelements such as sulphur, phosphorus, calcium, selenium, tellurium So that rotor easy processing is cut, and the corrosion resistance of rotor is not influenced, and do not significantly reduce the intensity of rotor.
As an improvement, the iron content 80.93%, carbon element content 0.035%, silicon content 0.4%, sulphur are first Cellulose content 0.2%, phosphorus element content 0.015%, chromium content 13.15%, nickel element content 4.15%, molybdenum element content 0.45%, manganese element content 0.75%, other microelements 0.28%.
As an improvement, other described microelements include calcium, selenium, tellurium.
As an improvement, the hardening heat is 1000 degrees Celsius, air-cooled heat preservation 45 minutes.
As an improvement, an annealing temperature is at 570 degrees Celsius, soaking time 120 minutes, double annealing temperature existed 590 degrees Celsius, soaking time 180 minutes
As an improvement, the annealing temperature three times is at 590 degrees Celsius, soaking time 180 minutes.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below with reference to embodiment, the present invention is made Further to be described in detail, exemplary embodiment of the invention and its explanation for explaining only the invention, are not intended as to this The restriction of invention.
Embodiment: the present invention provides a kind of preparation method of screw vacuum pump rotor, comprising the following steps:
Step 1: iron, carbon, silicon, sulphur, phosphorus, chromium, nickel, molybdenum, violent and other microelements are selected to prepare screw vacuum pump blank Material requested, wherein the iron content 80.93%, carbon element content 0.035%, silicon content 0.4%, element sulphur contain Measure 0.2%, phosphorus element content 0.015%, chromium content 13.15%, nickel element content 4.15%, molybdenum element content 0.45%, manganese element content 0.75%, other microelements 0.28%；
Step 2: the material that step 1 is prepared is quenched, and 100 degrees Celsius of hardening heat, air-cooled heat preservation 45 Minute；
Step 3: rough-cast is carried out by rotator model；
Step 4: the blank completed to casting is tested, and inspection content includes dimension control, appearance test, physical and chemical inspection It tests and mechanical performance test,
Step 5: being heat-treated blank, and heat treatment is once annealed including normalizing and double annealing, an annealing temperature At 570 degrees Celsius, soaking time 120 minutes, double annealing temperature is at 590 degrees Celsius, soaking time 180 minutes；
Step 6: machine automatization roughing is carried out to the screw vacuum pump rotor for completing step 5；
Step 7: first time dynamic balancing inspection is carried out to the screw vacuum pump rotor for completing step 6；
Step 8: third time annealing is carried out to the screw vacuum pump rotor for completing step 7, annealing temperature exists three times 590 degrees Celsius, soaking time 180 minutes；
Step 9: the screw vacuum pump rotor for completing step 8 is carried out to carry out machine finishing processing；
Step 10: last dynamic balancing inspection is carried out to the screw vacuum pump rotor for completing step 9.
By control nickel and chromium equivalent ratio, between 0.33-0.40, the temperature value for " martensite " occur is improved, is occurred The the temperature value of " martensite " the high more meets the requirement of heat treatment process.Increase with carbon content, the hydrogen embrittlement harmfulness aggravation of material, It causes degree of segregation big and casting stress increases.This will concentrate on the increase of casting crack tendency and toughness decline, so Make carbon less than 0.06%.For the reasonable of smelting operation and improve casting fluidity, by the content of element silicon control 0.6~ 1%.Manganese element mainly plays deoxidation in the material, and excessively high manganese amount can reduce the temperature value of appearance " martensite ", therefore Under the premise of guaranteeing deoxidation, manganese element is less than 1%.Chromium is to guarantee that the material has high corrosion resistance and fatigue behaviour Essential element just has reversed austenite presence, and the Transition of Brittleness point of the material only when chromium content is greater than 10% - 1000C can be just lower than.Therefore, by the content general control of chromium 12~14%.Nickel element harden ability, and make the material Reversed austenite is obtained in drawing process, and reversed austenite increases with the increase of nickel content.But nickel element, which reduces, to be occurred The temperature value of " martensite ", therefore by the control of nickel element content between 3.5~4.5%.Molybdenum element main function is to increase back Fiery stability reduces temper brittleness, and can improve the corrosion resistance of the steel.It controls as molybdenum content 0.4~0.6%, because Excessively high molybdenum element content is larger to the temperature value reduction of appearance " martensite ", carries out volume expansion at a lower temperature, no Conducive to heat treatment, behaviour is ashamed.
Screw vacuum pump rotor its mechanical property data through embodiment production as shown in Table 1, heating when the coefficient of expansion such as Table two is shown, its elasticity modulus is 205KN/M2, Poisson's ratio 0.284, specific heat are 510J/ (kgK), thermal conductivity 20.7W/ (MK), mass density 7.5g/cm3.
Table one
20-100℃ 20-200℃ 20-300℃ 20-400℃ 20-500℃
13.9 13.9 12.9 13.0 13.2
Table two
Above-described specific embodiment has carried out further the purpose of the present invention, technical scheme and beneficial effects It is described in detail, it should be understood that being not intended to limit the present invention the foregoing is merely a specific embodiment of the invention Protection scope, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should all include Within protection scope of the present invention.

Claims (6)

1. a kind of preparation method of screw vacuum pump rotor, it is characterised in that: the following steps are included:
Step 1: iron, carbon, silicon, sulphur, phosphorus, chromium, nickel, molybdenum, violent and other microelements are selected to prepare needed for screw vacuum pump blank Material, wherein iron content 80.88~80.98%, carbon element content 0.03~0.04%, silicon content 0.35~ 0.45%, sulfur content 0.015~0.025%, phosphorus element content 0.01~0.02%, chromium content 13.0~ 13.5%, nickel element content 4.1~4.2%, molybdenum element content 0.4~0.5%, manganese element content 0.7~0.8%, other are micro- Secondary element 0.2~0.5%；
Step 2: the material that step 1 is prepared is quenched, and 950~1050 degrees Celsius of hardening heat, air-cooled heat preservation 30~60 minutes；
Step 3: rough-cast is carried out by rotator model；
Step 4: to casting complete blank test, inspection content include dimension control, appearance test, physical and chemical inspection with And mechanical performance test,
Step 5: being heat-treated blank, and heat treatment is once annealed including normalizing and double annealing, and one time annealing temperature exists 520~620 degrees Celsius, soaking time 90~150 minutes, double annealing temperature at 540~640 degrees Celsius, soaking time 150~ 210 minutes；
Step 6: machine automatization roughing is carried out to the screw vacuum pump rotor for completing step 5；
Step 7: first time dynamic balancing inspection is carried out to the screw vacuum pump rotor for completing step 6；
Step 8: carrying out third time annealing to the screw vacuum pump rotor for completing step 7, three times annealing temperature 540~ 640 degrees Celsius, soaking time 150~210 minutes；
Step 9: the screw vacuum pump rotor for completing step 8 is carried out to carry out machine finishing processing；
Step 10: last dynamic balancing inspection is carried out to the screw vacuum pump rotor for completing step 9.
2. a kind of preparation method of screw vacuum pump rotor according to claim 1, it is characterised in that: the ferro element contains Measure 80.93%, carbon element content 0.035%, silicon content 0.4%, sulfur content 0.2%, phosphorus element content 0.015%, chromium content 13.15%, nickel element content 4.15%, molybdenum element content 0.45%, manganese element content 0.75%, Other microelements 0.28%.
3. a kind of preparation method of screw vacuum pump rotor according to claim 1, it is characterised in that: described other are micro Element includes calcium, selenium, tellurium.
4. a kind of preparation method of screw vacuum pump rotor according to claim 1, it is characterised in that: the hardening heat It is 1000 degrees Celsius, air-cooled heat preservation 45 minutes.
5. a kind of preparation method of screw vacuum pump rotor according to claim 1, it is characterised in that: the primary annealing Temperature is at 570 degrees Celsius, soaking time 120 minutes, and double annealing temperature is at 590 degrees Celsius, soaking time 180 minutes.
6. a kind of preparation method of screw vacuum pump rotor according to claim 1, it is characterised in that: described to anneal three times Temperature is at 590 degrees Celsius, soaking time 180 minutes.
CN201910728865.2A 2019-08-08 2019-08-08 A kind of preparation method of screw vacuum pump rotor Pending CN110358982A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910728865.2A CN110358982A (en) 2019-08-08 2019-08-08 A kind of preparation method of screw vacuum pump rotor

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Application Number Priority Date Filing Date Title
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111644823A (en) * 2020-06-18 2020-09-11 北京通嘉鼎元科技有限公司 Rotor and machining method thereof, pump body assembly and machining method thereof and vacuum pump
CN111664091A (en) * 2020-06-18 2020-09-15 北京通嘉宏瑞科技有限公司 Integrated rotor and machining method thereof, pump body assembly and vacuum pump
CN111734626A (en) * 2020-07-08 2020-10-02 北京通嘉鼎元科技有限公司 Vacuum pump assembly, vacuum pump and production and use methods thereof

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111644823A (en) * 2020-06-18 2020-09-11 北京通嘉鼎元科技有限公司 Rotor and machining method thereof, pump body assembly and machining method thereof and vacuum pump
CN111664091A (en) * 2020-06-18 2020-09-15 北京通嘉宏瑞科技有限公司 Integrated rotor and machining method thereof, pump body assembly and vacuum pump
CN111734626A (en) * 2020-07-08 2020-10-02 北京通嘉鼎元科技有限公司 Vacuum pump assembly, vacuum pump and production and use methods thereof
CN111734626B (en) * 2020-07-08 2021-03-23 北京通嘉鼎元科技有限公司 Vacuum pump assembly, vacuum pump and production and use methods thereof

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Application publication date: 20191022